Atmospheric hammer



(No Model.)

' J. 'C. BUTTERPIELD.

ATMOSPHERIC HAMMER. N0. 285,390. atented-Sept. 25, 1883.

1i I W l IF Q r H J1 m ll" Ill Witness v Inventor:

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- granted to me.

NITED STATES PATENT OFFICE.

JOHN C. BUTTERFIELD, OF CHICAGO, ILLINOIS.

ATMOSPHERIC HAMMER.

SPECIFICATION forming part of Letters Patent No. 285,390, datedSeptember 25, 1883.

Application filed May 8, 1883. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN G. BUTTERFIELD, of Chicago, Cook county, in theState of Illinois, have invented a new and useful Improvemen in thatclass of Atmospheric Hammers and Stamp-Machines for which Letters Patentof the United States have been heretofore In those machines thedriving-power applied to the crank is transmitted to the walking-beam bymeans of a cylinder carried by the crank and compression of air onopposite sides of the piston alternately.

A development of heat is awell-known effect of air compression, and whenthe machines alluded to above are run at high speed or on heavy duty thedevelopment of heat becomes inconvenient and detrimental to packings,&c.

I Mypresent invention relates to said cylinders; and it consists in awater-jacket around the upper part, whereby water may be applied to takeup and carry the undesirable excess of heat.

That others may fully understand my improvement, I will particularlydescribe it, having reference to the accompanying drawings, whereinFigures 1 and 2 represent in elevation and part section the air-cylinderwith water-j acket applied.

A is the air-cylinder, essentially like the corresponding cylindersdescribed in the patent above referred to. B is the driving-crank uponwhich said cylinder is mounted and can ried.

O is the piston-rod, jointed at its upper end to the walking-beam. 1

The jacket D, I find it convenient to make of cast -iron in two parts,bolted together along a vertical joint, so that it can be readilyapplied to the cylinder. It is in contact with said cylinder alongone-third the distance from its end, or thereabout, and at its upper endits edge is turned over inward, with a curved section, so as to preventits oscillatory movements from throwing the water out. It is alsoprovided with small leak-holes at its lower part through which thewatermay escape down the sides of the cylinder to cool its lower end. Thelower end does not require this relief to the same extent as theupperend, because being in intimate contact with the mass of metal in thecrank theheat generated is more quickly and certainly dissipated.

Water may be delivered from a stationary pipe properly located. Itshould be provided with a cock, I, whereby the water-supply can beregulated at will.

The mid-section of the air-cylinder is provided with vent-holes H, forthe purpose of enabling the air to escape from in front of the piston upto the mid-point of the stroke, and it enters again immediately afterthe piston has passed. The lubricant is thereby blown out at these holesat each passage of the piston, and to prevent it from being lost I putbefore said holes a screen, E, whereby the lubricant is arrested as itisblown out, and when the piston has passed said holes the lubricant issucked in again with the inflowing air. The waste-holes J in the j acketD are so located that no part of the escaping water will find its waywithin the screen E.

Having now described my improvement, what I claim as new is 1. Thereciprocating air-compressing cylinder A, provided with a water-jacket,D, open at top and extended above said cylinder, so that water may befed therein from a stationary source of supply, substantially asdescribed.

2. The aircompressing cylinder A and water-jacket D, extending part wayover the length of said cylinder, and provided with waste-holes J,whereby water may be permitted to escape down the sides of said cylinderbelow the jacket.

3. An air-compressing cylinder, A, having air-vents H at itsmid-section, for the purposes set forth, and provided with the screensE, covering said vents, substantially as set forth.

4. A11 air-compressing cylinder, A, having one or more air-vents, H, atits mid-section, for the purposes set forth, and provided with thescreens E, covering said vents, substantially as and for the purpose setforth.

JOHN G. BUTTERFIELD.

Witnesses:

R. D. 0. SMITH, J. O. TURNER.

